Shelving unit



FIG. 1 is a perspective view of a shelving unit showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof; and,

FIG. 4 is a left side elevational view thereof, the opposing right side elevational view being the same thereof. 

The ornamental design for a shelving unit, as shown and described. 